diff options
Diffstat (limited to 'fs/nfsd/nfsctl.c')
| -rw-r--r-- | fs/nfsd/nfsctl.c | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c new file mode 100644 index 000000000..c466321ed --- /dev/null +++ b/fs/nfsd/nfsctl.c @@ -0,0 +1,251 @@ +/* + * linux/fs/nfsd/nfsctl.c + * + * Syscall interface to knfsd. + * + * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/version.h> + +#include <linux/linkage.h> +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/fcntl.h> +#include <linux/net.h> +#include <linux/in.h> +#include <linux/nfs.h> +#include <linux/version.h> +#include <linux/unistd.h> +#include <linux/malloc.h> + +#include <linux/sunrpc/svc.h> +#include <linux/nfsd/nfsd.h> +#include <linux/nfsd/cache.h> +#include <linux/nfsd/xdr.h> +#include <linux/nfsd/syscall.h> + +#if LINUX_VERSION_CODE >= 0x020100 +#include <asm/uaccess.h> +#else +# define copy_from_user memcpy_fromfs +# define copy_to_user memcpy_tofs +# define access_ok !verify_area +#endif +#include <asm/smp.h> +#include <asm/smp_lock.h> + +extern long sys_call_table[]; + +static int nfsctl_svc(struct nfsctl_svc *data); +static int nfsctl_addclient(struct nfsctl_client *data); +static int nfsctl_delclient(struct nfsctl_client *data); +static int nfsctl_export(struct nfsctl_export *data); +static int nfsctl_unexport(struct nfsctl_export *data); +static int nfsctl_getfh(struct nfsctl_fhparm *, struct knfs_fh *); +/* static int nfsctl_ugidupdate(struct nfsctl_ugidmap *data); */ + +static int initialized = 0; + +/* + * Initialize nfsd + */ +static void +nfsd_init(void) +{ + nfsd_xdr_init(); /* XDR */ +#ifdef CONFIG_PROC_FS + nfsd_stat_init(); /* Statistics */ +#endif + nfsd_cache_init(); /* RPC reply cache */ + nfsd_export_init(); /* Exports table */ + nfsd_lockd_init(); /* lockd->nfsd callbacks */ + nfsd_racache_init(); /* Readahead param cache */ + initialized = 1; +} + +static inline int +nfsctl_svc(struct nfsctl_svc *data) +{ + return nfsd_svc(data->svc_port, data->svc_nthreads); +} + +static inline int +nfsctl_addclient(struct nfsctl_client *data) +{ + return exp_addclient(data); +} + +static inline int +nfsctl_delclient(struct nfsctl_client *data) +{ + return exp_delclient(data); +} + +static inline int +nfsctl_export(struct nfsctl_export *data) +{ + return exp_export(data); +} + +static inline int +nfsctl_unexport(struct nfsctl_export *data) +{ + return exp_unexport(data); +} + +#ifdef notyet +static inline int +nfsctl_ugidupdate(nfs_ugidmap *data) +{ + return -EINVAL; +} +#endif + +static inline int +nfsctl_getfh(struct nfsctl_fhparm *data, struct knfs_fh *res) +{ + struct sockaddr_in *sin; + struct svc_client *clp; + int err = 0; + + if (data->gf_addr.sa_family != AF_INET) + return -EPROTONOSUPPORT; + if (data->gf_version < 2 || data->gf_version > NFSSVC_MAXVERS) + return -EINVAL; + sin = (struct sockaddr_in *)&data->gf_addr; + + exp_readlock(); + if (!(clp = exp_getclient(sin))) + err = -EPERM; + else + err = exp_rootfh(clp, data->gf_dev, data->gf_ino, res); + exp_unlock(); + + return err; +} + +#ifdef CONFIG_NFSD +#define handle_sys_nfsservctl sys_nfsservctl +#endif + +int +asmlinkage handle_sys_nfsservctl(int cmd, struct nfsctl_arg *argp, + union nfsctl_res *resp) +{ + struct nfsctl_arg * arg = NULL; + union nfsctl_res * res = NULL; + int err; + + lock_kernel (); + if (!initialized) + nfsd_init(); + if (!suser()) { + err = -EPERM; + goto done; + } + if (!access_ok(VERIFY_READ, argp, sizeof(*argp)) + || (resp && !access_ok(VERIFY_WRITE, resp, sizeof(*resp)))) { + err = -EFAULT; + goto done; + } + if (!(arg = kmalloc(sizeof(*arg), GFP_USER)) || + (resp && !(res = kmalloc(sizeof(*res), GFP_USER)))) { + err = -ENOMEM; /* ??? */ + goto done; + } + copy_from_user(arg, argp, sizeof(*argp)); + if (arg->ca_version != NFSCTL_VERSION) { + printk(KERN_WARNING "nfsd: incompatible version in syscall.\n"); + err = -EINVAL; + goto done; + } + + MOD_INC_USE_COUNT; + switch(cmd) { + case NFSCTL_SVC: + err = nfsctl_svc(&arg->ca_svc); + break; + case NFSCTL_ADDCLIENT: + err = nfsctl_addclient(&arg->ca_client); + break; + case NFSCTL_DELCLIENT: + err = nfsctl_delclient(&arg->ca_client); + break; + case NFSCTL_EXPORT: + err = nfsctl_export(&arg->ca_export); + break; + case NFSCTL_UNEXPORT: + err = nfsctl_unexport(&arg->ca_export); + break; +#ifdef notyet + case NFSCTL_UGIDUPDATE: + err = nfsctl_ugidupdate(&arg->ca_umap); + break; +#endif + case NFSCTL_GETFH: + err = nfsctl_getfh(&arg->ca_getfh, &res->cr_getfh); + break; + default: + err = -EINVAL; + } + MOD_DEC_USE_COUNT; + + if (!err && resp) + copy_to_user(resp, res, sizeof(*resp)); + +done: + if (arg) + kfree(arg); + if (res) + kfree(res); + + unlock_kernel (); + return err; +} + +#ifdef MODULE +/* New-style module support since 2.1.18 */ +#if LINUX_VERSION_CODE >= 131346 +EXPORT_NO_SYMBOLS; +MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); +#endif + +static unsigned long old_syscallvec; + +extern int (*do_nfsservctl)(int, void *, void *); + +/* + * Initialize the module + */ +int +init_module(void) +{ + printk("Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); + nfsd_init(); + do_nfsservctl = handle_sys_nfsservctl; + return 0; +} + +/* + * Clean up the mess before unloading the module + */ +void +cleanup_module(void) +{ + if (MOD_IN_USE) { + printk("nfsd: nfsd busy, remove delayed\n"); + return; + } + do_nfsservctl = NULL; + nfsd_export_shutdown(); + nfsd_cache_shutdown(); +#ifdef CONFIG_PROC_FS + nfsd_stat_shutdown(); +#endif + nfsd_lockd_shutdown(); +} +#endif |